Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa571d346a4b079…

MALICIOUS

PDF

70.1 KB Created: 2021-09-03 20:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d3ef273227069cc23dc834a262e922c SHA-1: 3ec266b9b05bc432936efb16e1eb809864e10e9e SHA-256: bfa571d346a4b079d38750a3c776ce6dd408b638d69454ad11ccda82633b93dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs on compromised hosts implies a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qtl7ji63uvp606ro00euaffgcr/8861504437.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/lh8s0t7h86s4ab858otmsb0ips/bojume.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d024d90071f---78909604219.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/80972555730.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084382792c9b---xewimulovodejajoteraf.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/7479164803.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1611a55350e977---79404709133.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2bab9d4cf---xivagiter.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bnsuc4fsc523er79bn2m25l5f0/66758951463.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/49fc342b840e645f15a12d8ec41de2e3/75065611622.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aaac4e813a1---91470661267.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53fdfc494f---71334844760.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e287015a---mukojiw.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6d8d4d7e6d631855626c24ae466d7326/25496464610.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/sosirosivevana.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/wibok.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1b2bf6165409899796a6f217f270bfbd/belugibububawa.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/sereneziwobabakosima.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7bbd96c559---69087900928.pdfIn PDF document text
    • https://actorconseil.com/files/file/jelinodek.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/35496942965.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/gojuwagapinarakirudejazu.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/30300108525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=brock+microbiology+book+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB541 14392 bytes
SHA-256: 9f2209968ec35a86a22d58d43157f270a8f2ac9a004ccd22fb0ea7a4938dffe3
font_01_sfnt_off0000d932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 11048 bytes
SHA-256: ca10eb10252d9f783eedc82ec6114beef3cc6078652f10f91323da3efa0f1356
font_02_sfnt_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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